class_docstr: Container to cache the real VariableTracker
class_docstr_tok: ["Container","to","cache","the","real","VariableTracker"]
code: def __init__(self, value, source):
      assert source
      self.value = value
      self.source = source
      self.vt: Optional[VariableTracker] = None
  
file_path: pytorch/torch/_dynamo/variables/lazy.py
imports: import functools
  from typing import Optional
  from .base import VariableTracker
label_desc: Use image node_id 1 to create a new LazyCache object  with example: obj = LazyCache(value, source)